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Notes -
But some people have chronic jamais vu for a long time. So it can't just be caused by seizures. Unless people can have constant seizures.
The definition of a seizure is simply uncontrolled/abnormal erratic firing of a group of neurons. That can range from anything from weird sensations, muscle jerks or stiffness, and largely inconsequential things like deja vu and jamais vu.
Just because it's a "seizure" doesn't mean it has to align with the popular conception of someone passing out or thrashing about on the floor! Even more broadly recognized forms of seizures can be of little longterm consequence, such as absence seizures in children, which manifest as them zoning out or staring, or just automatically doing things like walking while having no later recollection of events.
DV/JV can be a sign of temporal lobe epilepsy, but is posited to be occur as a very minor/inconsequential form of "seizure" by itself.
For example:
https://pubmed.ncbi.nlm.nih.gov/23315620/
There is also active debate on the topic, such as:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3420423/#sec7title
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